Electric calculating machine



Dc. 16, 1941. w. HEINZE ELECTRIC CALCULATING MACHINE Original FiledMarch 20, 1933 7 SheetsShet 1 'De. 16, 1941. W, HE|NZE ELECTRICCALCULATING MACHINE Original Filed March 20, 1933 '7 Sheets-Sheet 2 Dec.16, y1941. w.'HE1NzE 2,266,366

ELECTRIC CALCULATINC MACHINE Original Fil'ed March 20, 1933 1'7Sheets-Sheet 3 Dec. 16, 1941.

w. HEINZ: I ELECTRIC CALCULATING MACHINE Original Filed March 20, 1933'7 Sheets-Sheet 4 Dec. 16, 1941. Y. w. HEINzE 2,266,366

ELECTRIC CALCULATING `MACHINE Original Filed March 20, 1953 '7Sheets-Sheet 5 Dec. 16, 1941.- W, HElNzE` 2,266,366

ELECTRIC CALCULATING MACHINE Original Filed March 20, 1933 '7Sheets-Sheet 6 fix e Dec. 16, 1941- w. HEINZ-E 2,266,366

' .ELECTRIC CALCULATING MAQHINE original Filed March 2o, 19:53 'rshets-sheet 7 con/rec [feg raw from ,070.1

and relates to an number and is added.

- engagement with the i RatepdfDec. 1,6, 1941 m ELECTRIC CALCULA'rrNCMACHINE Werner Heinze,

many, assigner `Zella-ltiehls, ,'lihuringia, (ier-v to MercedeslBromaschinen- Werke Aktiengesellschaft: Zella-Mehlis, Thuv ringia,Germany l195i), Serial N0.,290,920. In

12 Claims.

ThisA application is a continuation of my application Ser. No. 661,820,led March 20,1933 electric calculating machine, which is not only drivenbya motor but the Valuesjset' up in the key board vare also electricallytransferred into the4v calculating mechanism. The machine performs allfour calculations, multiplicationas repeated addition `and division asrepeated subtraction. According tothe invention, subtraction is alsoperformed as'addition while the value set up in the machine isautomatically'changed-into its complementary The advantages obtained bythis-method are very great. As the value of -a'vertically arrangedseries of keys'is only led through an electric conductor, the complexand expensive transference mechanisms are eliminated, indeed, ifrequiredthe entire key board from the calculating mechanism. YIt is,however, especiallyY important that in the diiierent kinds ofcalculations, the totalizerv does not require to be-.displaced. In thisnew machine, this function is performed by-a simple reversed. Theexpensive switch which is easily totalizer tcarriage with its accurateguides and complicated moving mechanism is eliminated. The machine canthus be enclosedv in a dust-tight manner, which is not possible with adisplaceable vcarriage, so that .the machine is serviceable for` a muchlonger period than the present machines. j

.The speed of calculating is'likewise .high `as the masses to be movedare direction 'of rotation is the same in all kinds of calculations. l

vThis is important in automatic division and j abbreviatedmultiplication. f

. ',Ifhe most important consideration nevertheless l is the cost-.criacalculating machine. VBy thev simplel construction of the calculatingmachine which does -notrequire the greatest precision in its 4productionand,

carriagedisplacementjas well as by the simple arrangementof the keys andthe changeover frompositive and negative types of calculation, theproduction costs of the present machine are far beneath that of theusuahmachine. As the magnets only require a weak current fortheiroperation, the contact transmission presents no diiculty. Also, thenoise peculiar to calculating machines, due to special stops whichprevent the over-running of the numeral wheels, is eliminated, for inthe described machine, the driven calculating wheels are stopped bytheir being in toothed driving segments,

by the elimination .of the `(ci. zas-fen kinds of Germany March theright moment by the making alive of Vsaid magnets.

In the drawings, one embodiment of the invention is represented by wayof example:`

, Figure 1 shows an elevation of the machine in perspective. j

Figure 2'shows a side elevation viewed in the direction' of the varrow Bin Figure 1, ythe left hand lside wall of the machine being removed forpurposes of illustration. y K

Figure 3 shows a front elevation of thev ma.- chine, in whichdifierentpartsof the mechanism are only partially shown in order torender other parts visible. Figure 4 shows a section through the set ofkeys on thesection line C-C .v'iewed in' the dii rection of the arorw Bin Figure 1.'

. the tens transfer.

Figure l5 shows a perspective elevation of the `tens-transfer mechanism,viewedfrom the front left-handsideof the machine. l'

l Figure .6 shows a view oi theMaltesedrive for vFigure 7 shows anelevation of the motor contactand motor drive viewed in the direction ofthe arrow H in Figure 1.

Figure .shows a part elevation ofthe set of l keys, of the units placeviewed in'y the direction small iand, also since the of thearrow H inFigurel. y Y

' Figure Si shows a perspective representation of the locking device for the dlsplaceable' contact plate. y I v Figure' A10 shows theresetting' mechanism viewed in the direction ofthe arrow B in Figy ure 1Figure 11 shows a secondemb'odiment of the resetting mechanism viewedinthe direction of the arrow Bin Figure v1. v

Figurey 12 showsa diagrammatic view of the connections ofthe calculatingmachine. I

Figures l13 and 14. show partial elevations of the connections diagramwith different connecwhile the latter are stopped quite noiselessly at55 tions.

Figure 15 shows a second form of execution of la detail.

The machine consists of a housing I, Figures 2 and 3, in which the setof keys K (Figure 1) is arranged. On the left beside the-set of keys K,the function keys are disposed, namely, the addition and multiplicationkey 2, the subtraction and division key 3, the resetting key l, forresetting the result register R to zero, the columnshifting key 5 on the"left, and the column shifting key 6 on the right. On the right handside bf the'machine beside the set of keys K, the

cancelling key 1, for the set of keys K is arranged.

Above the set of keys K on the right hand side of the machine, theindicating mechanism A for the set of keys K, is disposed, and on theleft hand side of the machine, beside the indicating mechanism A, therevolution counter U is arranged.

Above the revolution counter U, the column indicating mechanism D visarranged. The reference 8 indicates the rotatable knob fork settingthecolumn displacement and the reference 9 indicated the wing nut forresetting of the revolution counter U. Above the result register R, the

column indicating mechanism G-for the result t'otalizer R is arranged.Finally on the righthand side, the motor M is arranged. By the referenceNar, the plug for the connecting cable Ca is indicated.

The key frame consists of three plates I0, II and I2, Figures 2 .and 4,in which frame the lower plate IU on its front and rear sides isconstructed to form angle pieces of which the parts I3 thereof are xedto the intermediate plate II by means of screws I4 (in Figure 2, thefront connection only is represented). The intermediate plate Ilzisconstructed of a U-shape at'its front and rear sides, and its parts I5are fixed by means of screws I6, Figure 8 to the upper plate I2, so thatthe 'three plates III, II and I2 form a rigid housing. The housing isfixed in a suitable manner with the remaining frame of the machine to belater described. i

0n the lower plate I0 a contact plate I1 is arranged so as to bedisplaceable in the direction -of the arrow a and also in the directionopposite to ,that of the arrow a by means later described. On thiscontact plate I1, contact studs St (Figures 4 and 12) are arranged, fromthe contact studs St of which, -represented with the filled-in circles,conductors L lead .to insulating discs S, which are hereinafterdescribed, While from the contact studs StS -represented by hollowcircles, electrical conductors lead to the contact studs Stcorresponding to the complement of the contact studs StS.

' walls 29 and 30 (Figure 3).

plate 32 is provided an inspection aperture 3l On the lower sideof theintermediate plate- II, of the key frame housing an insulating plate I8carrying. contact springs C is fixed. Allcontact springs C of one keyrow 0" to "97 are in electrical connection with one another, whichconnections AU (Fig. 12), AT, AH etc. lead to the contact springs 234(Figures 3 and 12)' of a distributor, described hereinafterin detail.The contact springs C are capable f co-operating, as will -be laterdescribed in detail, at one time with the contacts St, of the contactplate I1, if the machine calculates in the positive sense, and at othertimes with the contacts StS of this plate, if the machine calculates inthe negative sense. The contact plate I1 is held both in the positiveand negative positions by a pawl I1a (Figure 9). The pawl I1a isfastened to the lower key frame plate I0.by means of a screw I1b and bymeans of a tension spring I1c which is fastened on thehone side to a lugHd formed on the pawl and on the other side to the stud I1e riveted tothe plate I0, is held in one of the notches I1f or I 'Ig provided in thecontact plate I1. The incline of .the wedge-shaped edges of the nose|13: of the pawl I1a and of the notches I1f and Ilg is such that ondisplacement of the contact plate I1 in the direction of the arrow a, orin the opposite direction of the arrow a, the pawl 1a is pressed out ofits actual notch,

' I8, may enter.

other side is attached to a pinv 43, arranged on The key stems I9carrying the keys K arearranged in the upper and intermediate plates I2,II, so as to be displaceable vertically. The keys .K are held in theirupper position (Figures 2. 4

and 8) by means of springs 20. In the key stems I9, pins 2l arearranged, which project through the key stems I9. 'I'he parts ofthe pins2l projecting through the left-hand side of the key stems I9 (viewedfrom the front of the machine) act on inclined faces 22, of the lockingbars 23 of which one'is provided for each vertical row of keys. Thelocking bars 23 are guided in any suitable manner and are usually urgedby a compression spring 24 in the opposite direction of the arrow a.Thus the inclines 22 of the locking bars lie against the pins 2| of thekey stems I9,

which again contact with the lower face of the plate I2, whereby thenormal position of the locking bars 23 is determined. 'I'he locking bars23 are further provided with recesses 24a, into which the pins 2| mayenter on thev depression of a key, and the keys K are thereby retainedin their depressed position.

Beside the locking bars 23 (Figures 2 and 4), a slidable indicator bar25 is arranged for each vertical row of keys, to each side of therearwardly directed free ends of which a disc 26 is riveted. Betweenthese discs 26, an in'dicator sector 21 is guided, which is pivotallymounted on a shaft 28. The bar 25 is provided between the discs 26 witha wedge-shaped end 25a with which the sector 21 is kept in permanentcontact by means of a spring 21h arranged between the sector 21 and thebar 25. The shaft 28 is rotatably mounted in bearings in the two side Onthe front 'cover (Figs. 1 and 2). By means of springs 33, which on oneside are attached to noses 34 of the'indicator bars 25, and on the otherside to the pins 35, fastened to the upper plate of the key framehousing, the indicator bars 25 are held in the direction of the arrow a,whereby their normal position is determined by the striking of theirinclined faces 36 on the pins 2l of the key stems I 9which 'engage theunder sideof the plate I2 of the key` frame support.

On the right-hand side of the key stems I9, for each series of keys isarranged a bar 31 (Figures 2 and 8), which is provided at its front endwith a recess 38, into which an insulating piece 39 of a spring 40,fastened to the insulating plate The bar 31 is usually held, i. e. whennone of the keys T are depressed, in the opposite direction te the arrowa, by means of the spring 4I, which on the one side is fastened to a pin42, lriveted t"o the bar 31 and on the the upper plate I2 of the keyframe, whereby its normal position is determined by contact of theinclined faces 44 of the rail 31 against the pins' '2I, which projectfrom the right side of the key stems I9, which pins 2I engage the underside of the upper plate I2.

The key stem 45 carrying the cancelling key v 1 (Figure 1) arranged onthe right hand side of the machine and vertically slidable in the upperplate I2 and intermediate plate Il, is held in its upper rest positionby means of the spring 48. The pin 41 (Figure 2) riveted into the keystem 45, is capable of acting on a 'cam 49, which is pinned to the shaft48. The shaft 48 is rof tatably mounted in two brackets 48a fastened tothe upper plate I2.

Further, on the shaft 48. nine cams 50, cnrresponding..v towthe 9ke`y.=rows, are arranged,

y which,ii`n a manneryto..be\later described, are

fcapableofvactingonfright angled bent lugs 5|,

`'of the locking bars`2l3.'

` The'key-stem 52 carryingfthe' additionandv multiplication. key 2,which is vertically slidable in the upper and; intermediate plates I2, I(Figvure 2) of thekey. frame housingvon theleft hand side ofthe machineis heldxin its upper position 'by meansof 'a spring 53 whereby thenormal position'is determinedbythe striking of the pin 52a housing. Thelower` edge 54 of the key stem acts,

on a lever 55, which,-by means of the sleeve 56 provided on it, is fixedon the shaft 51 The shaft 51 is swingably mounted -on the one side theshift cross isacted upon atonetixne in.thedirection4 of the 3 .arrow a..and .atanothertiref'in ,theopposite directionpf ,the arrowa.`In.'the,positifn`representedl inQFigures -2 and 9, the'fcontacts y I 1and y .88.arefinfthel addition position. OnA they left hand slideofthefmachinathe key stem 88 -`vi'zhich. carriesthe, resettingkey-4', isarranged so as to be displaeeable lverticallyrin the upper andintermediate plates lf2 and Il (Figure 18). By .means ofthe springf89`,-the key' 4 is held in its upper v.normal position, which is del'against the intermediate plate I Iof the key frame termined by strikingvof the pin 98ag'ainst the lower face of theintermediate plate 'lf thein the right-angled upwardly bent part 58 of the lower plate |8; and onthe other side in an angle piece 68 attached to the lower plate |8 bymeans of screws 59. Bymeans of a torsion spring v6| the shaft 51 isalways acted upon in the direction of the arrow m indicated in Figure 2,whereby the lever 55 presses upwards against the key stern 52, and thenormalyposvition of the shaft lever is capable of acting on the armv 61of a two.

The lever 68 is swingably a-rarmed leverv 68. ranged on the right handouter side of the wall 38,- by means of a screw 69,- -and on the oneside key is in the depressed `position represented by dotted lines inFigure l0, the part 940i a pawl `92-which is swingably arranged by'meansof a screw 8| on the intermediate plate ||,fis' capable,

under the action of.v thetorson spring 93.v of entering the recess 95 ofthe key stem 88 and holding'the` key in its depressed position.l".I'lfie pawl 92 may co-act with` the'lever 64 by means of an incline(not represented) on the arm 92a.

The lower edge 86 ofthe key'sternv 88 ,co-acts f with a lever 81 (Figure`l0), which is fixed on a is-.capable of acting by means of its edge 18on a i v .contact spring 1 I, and on the other side by means of its nose12 with a locking disc 14 fixed to the shaft13 mounted on a bearing 29aon the left hand side wall and the side wall 38 of the machine. Bymeans. of a spring 68a, thelever 68 is always maintained in Contact withthe locking disc 14, whereby the. normal position of the lever- 88 isdetermined.; The Contact` vspring 1| is attached in any suitable-mannerto an insulating plate 15..

The key stem 15, which carries the ,subtraction andv division key 3 ismounted so asto be dis-vA placeable vertically in the upperandintermediate plates'|2 `and .of thekey frame body,.is held by means ofthe spring 11 in Vits upper position, which is determined by thestriking of the vpin 18 againstthe intermediatev plate The key stem 16is capable .of acting by means of its lower edge 1,9, similarlmtotheadditionkey stem 52, lon. a lever 19a fixedon the shaft 51.

The pin 52a ofthe addition key stem. 52 is` capable, on the depressionof the key 2, of acting on the pin 8| arranged on theshift cross'88,which is swingably arranged lon the pin 82 riveted into the angle piece83 (Figure 2), which is xed by means of screws 83a to the intermediateplate II.- t I The downwardly directed armv of` the shift cross 88,which projectsthrough a. recess Illa (Figure` 9) of the lower plate |8,is of forked construction and its mouth 88a embraces a pin 84 of anangle piece 85, which is xed to the of the subtraction key 3, acts onthe pin 86 of the shift cross 88. By

plate I1,

connecting bridge 98, loosely rotatablel round the shaft 51. The lever91 co-yacts again with a' stud |88, xed on the lever 99. The level` 99is' fixed on the shaft 51. Further, 4on the connecting bridge 98,'.thelever |8I is xed', on the free end of which'akvery yieldable wire |82 isfixed. This slides ,over the roller |83 arranged .on the machinevhousing, overjth'e` roller |85 Aarranged on the shaft |84 fixed 'inthe'left-hand side wall 28, over the roller |86, which is arrangedon asuplport |89 fixedr by vmeans of screw |88 to the bridge |81l and overthe rollerl -I |'8I` arranged on the bridge |81.. At the other endy ofthe'wire, the same isy attached to aninsulatingpiece'l |2a, providedh ona contact spring A| I, *which normally, .that is, when. the resetting'key 4 is not depressed, is inconnectiofn with la contact' indicated vbyI4I2 in the` connection diagram (lig.l 12) The contact spring isfastened by means' of a screw |I|a to. an anglepiece |||b, which'againby means of screws I||c' is arranged on the .bridge |81'attached to theside walls 29 and 38 of lthe machine, ywherebyfthe,angle piece |I|bmeans oan insulating piecey I1f, is lseparated .from the bridge |81.Further, to the lever |8|, a wire I|3 is attached, which slides over therollers |83, |85 and over the. roll. ||4` (Figure l0), which I' is`loosely vrotatable on ay shaft ||5,.""rotatably mounted in Abearings ontheside walls 29` and 38' or the machine. At its-other end, the ywir@ H3means' of the screw |28 to ashaft |I9 swingably 'mounted inthelsidewgills I1 and |I8"v (Figures l Acontact plate I1. f The pin 18 ofthe key stem 18,

means of the alternate acv tion of theadditon key 2 and the subtractionkey 3, 'onthe shift cross 88,'t-he contact Band 10). l The shaft ||9isbevelled on its side facing the numerahwheels '|2|`,'v Between the.

wire 3, a spring |22 is inserted, which is designed to fulfill an objecttobe described later. The numeral wheels |2| are loosely rotatable on ashaft |23, fixed in the totalizer'frame's' I1, ||8

and by means of the distance sleeves |24 (Fig` `ures 3 and 5) areprevented'from axial displacement on the shaft |23. On the right-handside of the numeral 'wheels |2|, tooth Wheels |25 are xed, the purposeof which will be described later in a more detailed'manrler.A On theside walls |1 and I I8, of the totalizer frame, ytwo arms |21, |21a areeach fixed by means of rivets 126, |25a between which, by means of aheaded rivet, the rollers |28 or |2841 are rotatably mounted. Therollers y|28 or |28a are each capable of-acting with a cam |29 or |29awhich are fixed to a shaft 13, rotatably mounted on the two side wallsof the machine. By means of springs |3| (Figure 2), attached to the sidewalls H1, ||8 the rollers |28 and |`28a of the totalizer frame ||1,

I |8 are always held in contact with the cams |29,

|29a. A cam |32 (Fig. 10) arranged on the shaft ||5, is also capable ofco-acting in a manner later to be described, with the pin |33 rivetedinto the lever ||6.

On the shaft |34, fixed in the side walls ||1 and ||8 (Figures 2 and 5),a detent |35 is arranged for each toothed wheel, which detents engage inthe teeth of the toothed wheels |25 and hold these in the restA positionof the totalizer frame ||1, |I8. The detents |35 are held by means ofleaf springs |36, which are fastened by means of screws'l38 to a bridge|31, fixed to the side walls 29 and 30. Into each of the numeral wheels|2|, a pin |39 is riveted, which is capable of co-acting with a16-toothed wheel 4| (Figures 2 and 5) loosely rotatable on a shaft |40fixed in the side walls ||1 and ||8. With this toothed wheel |4i, afour-toothed wheel |42, which is capable of co-acting with a cam |43,and also a four-toothed wheel |44 are rigidly fixed, the four-toothedwheel |44 being capable of co-acting with the toothed wheel |25 arrangedon the numeral wheel |2| of the next higher decimal place. As is evidentin Fig. 5, on the left of each numeral wheel |2|', a set of three wheels|4|, |42 and |44 is arranged which are prevented from axial displacementby means of -the sleeves |45.

Further, on the shaft |34, detents |46 are swingably arranged and areacted on in the anticlockwisedirection by springs |41, the springs beingconnected on the one side to pins |46 arranged on the bridge |31.and onthe-other side to the noses |49, whereby the noses |50 of the detentsare held in engagement with the teeth of the toothed wheels |4| and thelatter are thereby prevented from unintentional rotationaldisplacements. The cams |43 are arranged on the shaft in the form of aspiral, so that they act consecutively on the four-toothed wheels |42.On the numeral wheel |2| in the units place, a pin |5| is riveted in theposition corre` sponding to zero and in the remaining numeral wheels |72pins |52 are riveted in positions corresponding to the 9 position, i. e.if the units numeral wheel |2| shows a zero at the inspection apertureand the remaining numeral wheels show a nine," the pin |5|- or the pins|52 must contact from below with the twist shaft ||9. The pins |5| and|52 are capable of coacting with the already mentioned shaft |9 in amanner to be described later.

A second form of construction of the resetting device will now bedescribed. To this end, on the key stem 88, a part |53 (Figure 11)provided with an incline is arranged,which is capable of acting on alever |54. The lever |54 'is' swingably mounted by means of the screw|55 on an angle piece |56 fixed to the left hand side wall 29 of themachine. On the upwardly directed arm of the two-armed lever |54, a pin|51 is fixed which projects in'to a ring groove, not shown, on a sleeve|59, which is fixed to the shaft |40 by means of the screw |58. 'I'heshaft |40 as well" as the toothed wheels |4I, |42 and |44 arranged on itwith the distance rings |45, on the depression of'the resetting key 4are displaced to the left (Figure 5), whereby the studs |39 of the nume'ral wheels |2| come out of the working position in relation to thetoothed wheels-IH.

The resetting -to zer'is effected, therefore, without tens transfermechanism. In this case, the cam |32, can be omitted as well as thestud|33, of the lever'||6. The lever l |6 can be formed according to Figure1l, as in this form of construction, the resetting to zero is attainedwithout tens transfer. On a shaft |60, xed in the two side walls, 29 and30 (Figures 2 and 5) oI` the machine, toothed segments |6|,'constructedaccording to Figure 5 are swingably mounted, the teeth of whichsegments, in a manner to be later described in detail, are capable ofengaging with the toothed wheels |25. As in the present machine, a'13vplace calculating mechanism is provided, there are, therefore, 13toothed segments arranged on the shaft |60. The toothed segments |6|areprovided with openings |62 into which the magnets |63 project. Themagnets |63 are xed to an arm 64 in any suitable manner. screws |65,swingably arranged on a wire, not represented, and is so held by meansof a spring (not shown) that its tooth-like part |66 is held out ofengagement with the teeth |61 of the toothed guide |68. The tooth-likeformed part |66 projects through the forked lower end of The toothedguide |68 is fixed to two shafts |69 and |10 fastened in the side walls29 and 30 of the machine. As the machine, as has been mentioned above isone with thirteen decimal places in the guide |68, thirteen openings |1|are punched which are provided on the lefthand side with ten teethcorresponding to the numerals 0 to 9 of the numeral wheels |2|. Further,on the guide |68, thirteen projections |12 are arranged which'renderimpossible a further-swinging out of the toothed segments |6|. By meansof the springs |13, which on one side* engage with the toothed segments|6| and on the ,other side are attached to a shaft |14, the toothedsegments |5| are always acted on in the anti-clockwise direction aroundthe shaft |60, whereby they normally rest against the rubber rings |14a.Levers |15 and |16 are fastened one at each end of the shaft |60 and areconnected by means of a rod |14, and are swingably mounted with theshaft |60.

To the lever |15 (Figure 2) a connecting rod |11 is jointed, which againat its free end is jointed to a cam |29. The cam |29 is fixed on theshaft 13 on the left-hand side of the machine and the cam |29a on theright-hand side of the machine.

It may be remarked that the toothed segment |6| can also be formed as adouble-sided toothed segment |-6| (Figure 15). |6| a are formed on thedownwardly directed part.of the toothed segment |6|, as shown in Figure15 whereby a secure engagement of the teeth |6|b of the pawl |6|e isobtained. The pawl |6|c is swingably mounted on a suitably mounted pin|6|d and is formed out of nonconducting material. On the pawl |6|c, ametallic member |6|f i's provided, which is capable of co-acting withthe` magnet |6 Ig. The remaining parts are formed exactly as in thef'lrst form 'discs S, corresponding to the values 0 to 9,

are rigidly Xed by meansof bushes |8| fixed The arm |64 is, by means ofthe In this case, the teeth i 21,266,366 l 3 l l. is actedupon at onetime rllihedirectionof the The keystem 52 carry-ingthe-addition andymultiplication key 2,; whichis vertically slidable in theupper andintermediateplatesn, (Figl ure: 2) of the key frame housing on the lefthand side :of themachine is'heldin its upper position by means of aspring 53 whereby the normal position is determined'by the striking ofthe pin 52a against the intermediate plate |A |-of the key framehousing.A The lower edge 54 of the key stem acts on a lever 55, whichybymeans ofthe sleeve 56 provided on it, is fixed on the shaft 51 'l'he'shaft 51 is swingably mounted on the one side inltheright-angledupwardly bent part 58 of the lower plate I0, and on the other side in anangle piece 60 attached to the lower plate |0 by means of screws 59. Bymeans of a torsion spring 6| the shaft 51 is always acted upon in thedirection of the arrow m indicated in AFigure 2, whereby the lever 55presses upwards against the key stem.52,.fand the normal position of theshaft 51 is determined.

On the rearwardly directed part of the shaft 51, a lever 62 (Figures 2and 3) vis fixed, which Ais provided with an incline 63 corresponding toFigure 3, which is capable-of coacting with aA lever 64 fixed on-theshaft 28 on the left-hand -rectionfo'f.l the arrow a.f"',1n theiposition 'represented in rieures and-95decenactssll and ythe shiftcrossUare'n the ddim 'POSionon the, left handside '0f ".the. machinethekey 'stem sa ,whlchearris theresettmg keys, is arranged` jso` 'as tobedisplaceabl'e vertically' inthe upper and intermediate pla'tesf |2andl|| (Figure ,10). By` meansl of Ithe sprngf89, the key 4 is held inits uppernormal position, which is der-terminedby strikingiofgthe pini90 against the side of the machine.l Further, on the shafty 28..

a'lever 65 (Figures 2, 3 and 7) i's fixed on the vright hand side, the nose 6 6 (Figure 2) of which lever is capable of acting on the arm 61 ofa twoarmed lever 68. The lever 68 .is swingably arranged on the righthand outer side ofthe wall vlower face of the intermediate plate `l.fthe key is inthe depressed position represented by dotted'lines inFigure 10, the part `14 of a' pawl 92 which is swingably arranged. bymeans of a screw 9| on the intermediate plate is capable,

.under the action ofthetorsion,l springv y93 of entering the recess 95ofthe key stem 88 and holding'the key in its depressed position. 'Thepawl 92 may co-act with the lever 64 by means of an incline (notrepresented) von the arm 92a.`

d 'I'he lower edge 96 of lthe key stem 'co-acts with a lever 9 1 (Figure10), which is xed on a connecting bridge' 98 loosely rotatable round theshaft 51. The lever 91 co-acts again with a stud |00, fixed on the lever99. The'lever 99'is fixed on lthe shaft 51. Further, on the connectingbridge 98, the lever ||J| is fixed, on the free end of 4which' a veryyieldable wire |02 is fixed.' This slides over the roller |03 arrangedon the ma- I chine housing, over the'roller' |05 arranged on 30, bymeans of a screw 69, and on the one side i A y is capable of acting bymeans of its edge 10 on a contact spring 1 and on the other side bymeans of its nose 12 with a locking disc 14 xed to the.

shaft 13 mounted on a-bearing 29a on the left hand side wall and theside wall .30 vof the machine. B y means of a spring 68a, the lever 68`is always maintained in contact with the locking disc 14, whereby thenormal position of theleverv -68 is determined. The'oontact. spring 1|is"'at tached in any suitable manner to an insulating plate 15.

vThe key stem 1 6, which carries the subtraction and division .key 3amounted so as te belydis- I placeable vertically inthe upper andintermediate plates I2 and of the key frame body, is held by means ofthe spring 11 in its upper pothe shaft |04fixed in the 'left-hand sidewall 29, over the roller |06, which is arranged on a support |09 fixed,by means of screwl |08 to the bridge vI||1 and over4 the roller; ||0varranged on the bridge |01.,A At the other end of the wire, the same isattached to an insulating piece ||2a, provided on a contact springjl I|`,"whi'ch normally, that is, when 'theresetting key 4'is not depressed,is in connection with acontact indicated by I I2 in the connectiondiagram (Fig. l2) The contact spring `is fastenedby means of a screwIlla to an angle piece |||b, which'again by means of screws |||fc isarranged on the bridge |01 attachedfto vthe side walls 29 and 30 ofthemachine, whereby-r ythefangle piece |||b by means of an insulating piecel| |1f is separated Furtherhto vthe leverv |0|, a wire I3 is attached,which "slides over the rollers 4"isl loosely rotatableV o nv a fshaft||'5,"r'otatably stion, which iszdetermined by the' striking of they pin.18 against the intermediate platei I. The

52, on a. lever 19a .fixed on the shaft 51.

The fpin 52a of the .addition'key stem. 52 is capable, on the depressionof the key 2, of ac ting on the pin 8| arranged on the shift cross 80,

lwhich is swingably arranged on the pin82 riveted into the angle piece83 (Figure 2), which is (Figure 9) of the lower plate |0,- is of forkedconstruction and its mouth 80a embraces a pin 84 of an angle piece 85,which is fixed t0 the i key stem 16 is capable of acting by means of itsI lower edge 19, similarly, to the .addition key stem Contact plate l1.The pin 1s of the key Stem 1s, of the subtraction key 3, acts on the pin86 of the shift cross 80. By means of the alternate acn tion oftheaddition key 2 and the subtraction `key 3, on the shift cross 80, thecontact plate |1,

Y mountedfinbearings on theusd'e walls 2 9 and 3|!v ofthe maollir'ie.vAt its other end, the'vvire ||3 'isLxed to a' leverjl|6',`,wl'iich"'agair i isz-'fixed by 'means'of the screw' |20 "to ashaft||9 swingably mounted in the side walls `||1 and III!vr (Figures 3 andl0).`r Thezshaftl I9 is bevelled on its side wire ||3, a spring |22 isinserted,A which is designed to fulfill an objectto bey described later.

'The numeral wheels |2| are loosely rotatable on a shaft |23, fixed inthe totalizer'fra'mes ||1, ||8 and by means of the distance sleeves |24`(Figlures`3 and 5) are prevented from axial displace- Between the.

to the shaft. On a bridge |01 fixed to the two side walls 29 and 30springs |84 and |85 the screws |83.4 Between the bridge |01 and thecontact springs |84 and |85'an insulated strip |96 is arranged. Thecontact springs |`85as is evident fromthe diagram of connectionsinFigure 12, lare jointed to the negative conductor Cd and the contactsprings |84 to the positivek conductor Z.

Further, on the shaft 13, the pin wheel |81 (Figures 2, 3 and 6) |88 areriveted into the pin wheel '|81 and are capable of coacting with theteeth |'89a of the Maltese cross |89 iixed to the shaft I I5. Further,on the pin wheel |81, a Slide disc .I9I is fixed by means of rivets andthis disc co-acts with the face |92 of the Maltese cross and preventskthe rotation of the latter.

Moreover,l on the shaft 13 (Figures 2, 3, 6 and '1), the worm wheel |93-is fixed and engages with the worm |94 of theidriving motor M.

On the left-hand side of the machine, the column left displacement key(Figures 1 and 2) is arranged and is'fixed to the key stem |95 which isguided in the upper plate I2. The key 5 is held in its upper normalposition by means of the spring |96, this position being determined byimpact of thepin |91 upwards against the plate I2. The lower part of thekey stem |95 is bent at right angles. To this right-angled bent part|9511, a pin I91a is riveted which is4 capable ofvacting on an incline|98 of the slide |99. -v

To the right of the column left displacement key 5, the column rightdisplacement key 6 (Figure 1) is arranged andis fastened to the key stem200. The key 6 is held in its upper normal position by means of thespring this position being determined by the impact of the pin 202upwards against the plate I2. To the down-` wardly directed part of thekey stem 200, a pin 203 is riveted, and this pin is capable of acting onan inclined face 204 of the slide |99.

To the nose 205 of the slide, a spring 206 is attached, the other end ofthe spring beingconnected in a suitable manner to a pin (not shown)which is fastened to the plate I. Further between the bent end 201 ofthe slide |99 and the part- I0g of the plate I0, a compression spring208 is arranged in a suitable manner. The tension spring 206', whichacts on the Slide |99 in the direction of the arrow a, and thecompression spring 208, which acts on the slide |99 in the oppositedirection tothe arrow a, are so designed lthat they balance one another,whilst they only come into operation when the slide |99 is disposed inone of the displaced positions. Inthe normal position ofthe slide |99,ran arresting pin 2|0 is capable of entering into a stop 2|| of theslide |99, and holding this inA its nor.- mal `position. If the slide|99 is displaced to the leftor the right, the pin 2|0 slides along onthe lower edge 2I2 of the slide |99.

- The slide |99 is displaceably arrangedin the f bent lug 2I3 in theplate- I Il (Figure 2) bymeans of aheaded screw 2I3a, whichprojectsthrough v the slot 2-'I4 of the slide |991.. Fu'rtherfthe slide|99 is vdisplaceablymounted at its othenend on the left-hand sidewall29,-by means'of a headed screw 2|5a, which projects throughthe slot 2I5of-the'slide. By means-of the screw A2I6, a pawl of the machin ,contactare fastened by means of' rangement 2I8, 2|9, positively guided. Herethe pin is fixed inthe left-hand side wall 29 ofthe machine. The forwardpartt220f of the pawl 2 I1 is, by means ofthev rivet 22|, swingablymounted on the'xedpart 22|a of the pawl 2I1,and is normally held soswung by means of lthe leaf spring 222 which is fastened tothefixed'part 22Ia 4of the pawl 2|11I by 4rivets 223, that its edge-224lies against thexedv part 22la of the is fastened. Eleven pins Further,on the slide |99, a second pawl 226 fastened. This is likewisepositively .guided by means of the pin and slot connection 221, 228. Theforward part 229 is swingably arranged on the pawl-226 by means of the-rivet 230.. By

means of ra leaf spring 230a, which is riveted to the pawl 226,the'movable part 229 of the pawl 226 is acted on in the clockwisedirection round the pin 230, whereby its edge 23| lies agains .the pawl226. Thepin 232 1 ably arranged in the machine side wall 29 on the lefthand side. On this pin, a milled knob nection with the rotatable part233 of a distributor. The'rotatable part 233 of the distribu- On vthetact springs 234 (Figure 3) are provided, which, as is shown in 'theconnections diagram (Figure 12) by means of conductors A are inconnection with the nine corresponding key rows. f On the rotatable part233 of the distributor, are further arranged two broad contact springs,Sc'and Scl (Figure 12), which slidev simultaneously, over severalcontact studs 235r (Figures 3, 12). The contact studs 235 are fastenedto' an insulated plate 236 and, as is` evident from the connections 2I1is swingably arrangedon the slide |99. -The diagram in Figure ,12, areconnected with the coils'WI to WI3 of the magnets |63. f

On the same pin 232, which projects on'the right of the left-hand sidewall wheel 231 (Figures 2 and 3) is fixed, with which theabove-mentioned pawls 2 I1 and 226 are capable of co-acting. To theright of this toothed wheel 231 and to the same, a vten-toothed sec` tor238 is fastened by means ofthe s crews 239.

The-toothed sector 238. is in engagement with a rack corresponding tothe rack 240 in Figure 2.

The rack 240 is slidably mounted on one side by means of the headedscrew 2 |5a', screwed'into the left-hand side wall. and projectingthrough theslot 24| and on the other side by aheaded screw 242a, whichprojects through the slot 242 of the rack 240. On the upwardly directedend 29,*a toothed (Figs. 2 and 3) is r tat- L8 is rigidly mounted, theknob being in xedconf of the rack 240, teeth 243 are likewise providedwhich are in engagement with a toothed sector 244. The toothedsector 244is fixed by means of screws 245 to a drum 246, which is rotatable on theshaft 241 which is mounted in the two side walls 29 and 30. On thecircumference of the drum 246, the numbers ,11 to f9. are.appliedcorresponding to the nnefvertical keyrows, `displaced through onedivision infeight-fold recur.- rence. In'the inspection apertures 24,8,always after positioning of the drum 246,.A the numbers from 1 toV 9 inthe'nitsiplace, tens'rplace and so forth are beginning@ show, YVandin`the'remaining. rightl "or left inspection apertures, a

white field, whicn1n` Figures is indicateduwith vertical hatched lines.Q

On the shaft 232 is fixed a drum' 250,*'p1ovided with anvincline'd face2.49. The inclined face249 arranged on the slide 252.y slide4 placeablyarranged by means of the screws 253 (Figures 2 and 3) on an angle piece254, arranged in the machine house in any suitable manner. The end ofthe slide 252 co-acts with a ilange 255 of the two-armed lever 256,which is swingably arranged on the angle piece 254 by means of the screw251. On the upwardly directed end of the two-armed lever 256, a pin 258is riveted which engages in a ring groove 259 of a sleeve 260, which isslidably but non-rotatably arranged on the shaft 260:1. On one of thesides of the sleeve 260, an angle piece 26| is rotatably mounted, on thefree end of which an indicator sponding bar 31 (Figure 8) takes place.The bars 263 is fixed by means of rivets 262, the indicator beingprovided witha white spot or small white plate 264, and is recognisablein the inspection apertures 265 of the indicator mechanism D. On thecover plate 32, below all the inspection apertures 265, of therevolution counter, aY black plate 266 is xed in any suitable manner,which likewise in the inspection apertures 265 is visible and can becovered by means of the white spot 264 of the indicator 263.

On the shaft 26M, acam disc 261 is further slidably but non-rotatablyarranged on the sleeve 266.' The cam 268 of the cam disc 261 is capableof co-acting with the individual toothed wheels 269'. The toothed wheels269 .are xed to the numeral wheels 210 of the revolution counter U.

'Ihe toothed wheels 269, just as thev numeral wheels 210, are looselyrotatable on the axle stud 21| arranged on the left-hand side wall 29 ofthe machine. By means of the fork 212 which is arranged in any suitablemanner, the numeral wheels 210 and the toothedwheels 269 are preventedfrom sliding off from the stud 21|. On the axle stud 21|, a wing nut 9is further arranged. In order to avoid an unintentional displacement ofthe numeral wheels 216 of the revolution counter U, a spring comb 214 isfastened to the key frame plate I2 by means of screws 215, the singlesprings 216 of which are in engagement with the toothed wheels 269. Onthe right-hand side of the shaft 13 (Figure 3), a toothed wheel' 280 isrigidly mounted, which is 31 act, therefore, with faces 31a on theinsulated pieces 39 of the contact springs 4|! and hold these in thismanner in contact with the contact studs StUoStTo and StHo (Figure 12)Consequently, in the units place, the circuit Z, ZoSo, Lo, StUo, 40(Fig. 8), AU (Fig. 12) B|,'W| and Cd remains closed at StUo, 4I, in thetens place, the circuit Z, ZoSo, Lo, St To, 40, AT, B2, W2, Cd remainsclosed at StTo and in the hundreds place, the.

circuit Z, Zo, Lo, StHo, 40, AH, B3 W3 and Cd remains closed at StHo,40. As in the thousands place, the key K'I'h5 (Figure l) is depressed,so vthe contact spring CTh5 belonging to the key l St'I'h5, CTh5, ATh5,B4, W4 and Cd is closed in engagementwith the toothed wheel 26| xedontheV shaft 260a, by which means the shaft To this end, it is firstnecessary to set up the preparatorily.

On the depression of the key K'I'IhZ (Figures 1 and 4) in the tenthousands place corresponding to the value 2 the contact CTTh2 belonging'to the key K'ITh2 comes in contact with the contact stud St'1Ih2,whereby the circuit (Figure 12) Z, Z2, L2,'StTTh2, CITh2 (Fig. 4),A'I'Ih (Figs. 4 and 12),' B5, W5 and Cd is preparatorily closed.

On the depression of the key KHThZ' in the hundred thousands place,corresponding to the value 2, the contact spring CHTh2, comes intocontact with the contact stud StHTh2, whereby the circuit Z, Z2, L2,StHThZ, CHTh2, AHTh, B5, W6, Cd is preparatorily closed. As in theremaining three key rows to the left, no value is set, so the springs46, as already was described above for the three right-hand key rows,connect the coils |63 (Figures 2 and 5) of the seventh to the ninthplace of the result register A with the contact studs StMo, StTMo andSti-IMO which are associated with the spring |65 (Figure 3) of the zerodisk So. The remaining four calculat ing places to the left of theresult register RIO- RI3. which are not in connection with one of thenine vertical key rows, obtain their current through the contact springCLo, (Figures 9 and 12), whereby the following circuits are preparavalue225000 in the set of keys, which is effected by depression of thecorresponding keys.

In order to elucidate the connections diagram, it may be remarked thatin the following description, the contact springs are denoted by C (Fig.8) the contact studs by St (Fig. 12) and thekeys in general by K. Thereference letters U, T, H, Th, T, Th and so forth behind the namedreference characters C, St, or K designate the key series, e. g. unitsplace tens place and'so forth. l

The indexes 1. 2, 3 and so on designate the corresponding value of thedepressed key. As in the units, tens and hundreds places, zeros are notAtorily closed Z, ZOSo, L0, CLO, LLO, SCI, BID,

WII, Cd; Z, ZoSo, L0, CLO, LBO, SCI, BII, WII,

Cd; Z, ZOSO, Lb, C10, LLO, SCI BI2, WIZ, Cd and.-

nally Z, ZoSo, Lo, CLo, LLo, SCI, BI3, WI3, Cd.

In consequence of the depression of the keys K'Ih5, KTTh2, and KHTh2,Figure 1, against the action of their spring 26, Figure 8, the pins 2|riveted to the key stems I9 act on the inclined faces 44 of the`corresponding bars 31 of the thousands place, of the ten thousandsplace and of the hundred thcusands place, whereby these are displaced inthe direction of the arrow a (Fig-- ure-8) against the action of theirSprings 4I. In this displacement of the bars 31, the correspondingcontact springs with their insulated piece 39 spring into the notches 3l(Fig. 4) of the bars 31. Whereby the contact springs 40 of thecorresponding key rows with their corresponding contact studs StTho,St'ITho and StHTho are put out of contact, so that the correspondingcircuits .As on the circuit the shaft 1a through the worm in wheel lesin the are interrupted by the ycontact springs 40 while, as hereabovedescribed, the circuits vover the contact springs CThs,CTTh2 and CHThZare closed.v

Afterthe circuits, Awhich are closed or interrupted when the figure225000` is registered in the set of keys, have been thus described, Ishall now describe the mechanisms which yare also activated bydepressing the keysKThS, K'IIh2 and KHThZ.

On depressing, the key KTh5 which corresponds to the value 5 in thethousands place, the pin 2| which is riveted on the key stem I9 actsupon the oblique surface 36 (Figure 2) 0f the indicator bar 25, whichlies under the key pin and displaces the same contrary to the pressureof its spring 33. 'I'his causes the upper edge 25al (Figure 4) of theleft end of the' indicator bar 25 direction of the arrow shown in Fig.2.

Immediately after the starting of the revolution of the shaft 13,.thecams |28 and |29 a (Figures 2 and 3)o which are flxed on the shaft 13,near the ends thereof will act upon the rollers |28, |28a which arearranged on the` frame ||'1, ||8

which carries the result vregister numeral wheels which is 4slightlybent upwards, to act from underf neath against the edge 21a of theindicator sector 21 and, therefore, pivots the latter intheanticlockwise direction round the shaft 28andagainst Y the action of thespring'21b, which is connected on the oneside to the pin 21o of sector21 and on the other side to the pin 25e of the plate I, and thispivotingmovement causes the indicator sector 21 to exhibit a 5. In' thesame way, the key pins 2| of the key KTIh2 -of the ten thousands Vplaceand the key KHThZ ofy the hundred thousands place act upon the'correspending inclined surfaces 36 of the indicator bars 25, so'thatthe indicator lsector 21 of vvthe ten thousands place will register a 2and the indica tor sector 21 of the hundred thousands position also a 2.v

Besides this, the pins 2| of the keys KT5, K'I'Ih2 and `KHTh2, on beingpressed down, will act upon the inclined surfaces 22 (Figures 2vand 4)of the locking bars calculating places, whichcauses them to be displacedcontrary to the action of their springs 24. When the keys KTh5, KTTh5'and KHTh2 'have reached their lowest position, the lockingbars 23,through the action of their springs 24, will spring to the left (Figures2, 4),y the pins 2| engaging into 'the notches 24a of the locking bars23 and holding in this way the keys KTh5, KT'ThZ andI KHThZfin theirdepressed position.

At this juncture, the addition key v2 is depressed against the action ofits spring 53. This causes the keyV stem 52 to act upon a lever 55 whichis fixedly arranged on the shaft 51, so that the shaft the indicator 23of the corresponding.

|2| and the tens transfer. mechanism.vv Consequently, the frame ||1, ||8which .is rotatably arrangedon the stationary shaft I I5, is .rocked inthe anti-clockwise direction against the action of the spring |3|. Thiscauses the toothed wheels |25, which are' flxedly connected with thenumber rollers |2| of the result totalizer IR; to engage with the teethof the toothed segments |6 During the rocking movement of the frame II1, I8, the detents |35, which are held by the springs |36, with theirarms |a, constantly against the detent bar |31, will remain in touchlwith the detent bar |31`|and the noses |356 which are arranged on thearms |351) of the detents |35 will disengage from the toothed wheels|25, so that the numeral wheels |2| which `are rigidly connected withthem will be able to move freely under the influence of the toothedsegments I6 I.

Now the insulator disc So which corresponds to the value 0 will releasethe contact springsv |84, |85 and this will definitely close thecircuit.` In consequence of this, the magnet |63 in the units 'placewill attract the arm,` |64, thus` causing the which tooth corresponds tothe value 0. This 51 will pivot against the pressure of a torsion spring6|, in the `clockwise direction (Figures 2 and 3). A lever 62 which isfixed to the shaft 51 will act with itsinclined surface 63 upon a lever64 which is arranged on the shaft 28 which is piyotably arrangedA in thetwo side walls 23, 30 of the machine. right side of the machine (Figures3 and '1) on the shaft 28, on being rocked in the anti-clockwisedirection (Figure 2), acts with itslnose|64 on a two-armed lever 68which ispivotably arranged on the screw 69 which is affixed to the rightside wall 3|) ofthe machine, and pivots this lever in theclockwiseldirection (Figure 2) .against the A lever 65 which is arranged 'on theaction of the spring 68a.- This lever acts with its face"10 on a contactvspring 1| which comes y'into contact with-its section' 'Hd with thecontact member 15a, thus'closin'g the circuit (Figure 12);

lever 68`releases .the car'n 14a ofthe locking disc 14 'wh/ich@ is yrigidly arranged on, the shaft 11|.A Upon release -of the di's'c14', theworm' |94drvs being closed the'no'se 12 of theprevents the'numeral wheel|2| of the units place from being rotated. Asfurthermore no key K hasbeen depressed in the tens and the hundreds places, the circuit tothemagnets in these places will also be closed at the same time as in theunits place, the corresponding magnets |63 attracting the arms |64, so.that the tooth-shaped part'l66 will engage with the first tooth of therack |68 in such a way that the toothed segments |6| are prevented from4rotating 'and the numeral wheels |2| register a zero, f

As, as hasbeen already stated, the springs 40 (Fig. 8) in the three leftrows of keys, connect the magnets |63 of the Vseventh' to ninthplace ofthe result register R. withv the contacts StMo, StTMo andStHMo (Fig-12)which are connected with the springs |84, |85, of the insulator disc So,the insulator disc S0, after a short rotation, will release the springs-|84, |V and thi-s willclose the circuits and the magnets |63v willattract the arms |64, `causing y,the tooth-shaped flanges |66 of thearms |64 to mesh withtherst tooth of the rack |68, preventing thetoothed' segments |6| of the seventh to ninth place from rotating-further. As the contact segment SCI (Fig. l2), by means of the leadLLO; the contact spring CLo and the lead y,is also connected to'the leadLo, it is vobvious that the operation'of themagnets |63 of the tenthyto. thirteen place is exactly the samen as Afor the seventh'to ninthplace, that is to say, al1 numeral wheels |2|" Aof the` seventh tothirteenth place exhibit zeros.,

After furtherv rotation ,of tu' yshaft '13 vinthe `'is set of keys in methousands piac'e'there is a 5,

in the ten thousands place a 2 and in the hundred thousands place a 2and the corresponding contacts |84, |85 have not yet been closed by theinsulating discs S2 and S5, the corresponding toothed segments |6| will,under the action of the springs |13, be rocked in the anticlockwisedirection round the shaft |60 until the discs So to S9 closethe'co'rresponding contacts |84, |85, the toothed segments |6| remaininguntil such time constantly in contact with the rubber roller |14a. ofthe rod |14 of the frame |15, |14, |16. This includes the followingoperations.

When the insulator disc S2, which corresponds to the value 2, releasesthe contact springs |84, |85 so that the latter come into contact, thepreviously mentioned circuit is definitely closed. The magnet |63 of theten thousands yplace now attracts the arm |64, wherebylthe tooth-shapedmember |66 will mesh with the third tooth of the rack |68 and the gearsegment 6| will be prevented from rocking further. The numeral Wheel 2|of the ten thousands place now registers a 2. As in the hundredthousands place the key KHTh2, which also corresponds to the Value 2 hasbeen depressed, the same process will take place as in the ten thousandsplace, so that there is no need to repeat the-description. After thenumeral wheels. |2| of the ten thousands and the hundred thousandsplaces registered each a 2, the disc S corresponding to tne key KTh5which corresponds to the value 5 in the thousands place releases thecontact springs |84, |85 so that the latter come into-contact andthepreviously mentioned circuit is definitely closed. At this moment, themagnet |63 in. the thousands place attracts the arm |64, and this causesthe latter to engage with its tooth-shaped member |66 with the sixthtooth of the rack |68, while the toothed segment l|6| is prevented fromrocking further. The toothed segment |6| has now rotated the numeralwheel I2! of the thousands place from "0 to 5. This means that the Value225000 which has been registered in the set of keys has been transferredto the numeral wheels |2| of the result register R. During the rockingof the toothed Segments |6|, the latter, under the influence of thesprings |13, remain in contact with the rubber roller` |14a of the rod|14 of the frame |15, |14, |16, until they are stopped by the teeth ofthe rack |58 in the manner which has been described hereabove. From thismoment onwards, the springs |13 will extend, until the rod |14 of theoscillating frame |15, |14, |16 hasreached its extreme pivotingposition. In this position, the rollers |28, |28a will slide from thehigher parts of the cams |29, |29a on to the lower parts of the cams|29, 29a and this will cause the register frame ||1, ||8 to rock in aclockwise direction round the shaft ||5 and the toothed wheels |25,which are rigidly connected with the numeral wheels |2|, to disengagefrom the teeth of the toothed segment |6|, so that the toothed wheels|25 are not influenced by the toothed segments |6| when the' latterexecute a return movement and are available, if required, for a tenstransfer of which I shall speak later.

At the same time, the detents |35 will again In the rst instance, thedisc S5 which corresponds to the value 5, will put the contact springs|84, out of contact, so that the circuit is interrupted. In consequenceof this, the corresponding magnet |63 will release the arm |64, so thatthe latter, under the action of a spring which is not shown in thedrawing, will disengage again with its member |66-from the tooth of therack |68.

During the further rotation of the shaft 13, the disc S2 whichcorresponds to the value "2 will interrupt the already mentioned circuitby interposing itself between the two contact springs |84, |85. Thiscauses the magnet |63 of the ten thousands place, and the magnet |63ofthe hundred thousands place, to release the arm |64, so that thetooth-shaped members |66 of the arms |64 disengage from the teeth of therack |68. The toothed segments |6| of the ten thousands place and thehundred thousands'plac will now, in consequence of a further rotation ofthe shaft 13 and the effect of the cam |29, by means of the connectingrod |11 rock the rod |14 of the frame |15, |14, |16 round the shaft |60in the clockwise direction (Figure 2).

Just before the rotation of the shaft 13 has been completed; the disc Sowhich corresponds with the value 0 will interpose itself between thecontact springs |84, |85 whereby the pre-v viously mentioned circuit isinterrupted and' the magnets |63 of the units place, the tens place andthe hundreds place as well as the magnets |63 of all the places to theleft of the hundred thousands place will release the corresponding arms|64, causing the tooth-shaped members |66 of the arms |64 to disengagefrom theteeth of the rack |68.

As the addition key 2 has been immediately released after it has beenstruck, the nose 12 of the lever 68 has come into contact With-thelocking disc 14 and slides on the latter. After the shaft 13 has madeone revolution, the disc 14 is stopped by the nose 12 -`of the lever 68and prevented from rotating any further. At the same time, the contactspring 1| is put out of contact with the contactmember 15a so that thecircuit is interrupted and the machine is stopped. All the mechanismhave no'w returned to their rest position.

In order to make it possible to deduct the value 87000 from the value225000, it is in the first place necessary to eliminate the value 225000from the set of keys.

For the purpose of eliminating the figure 225000 which has beenregistered in the set of keys, the cancelling key 1 (Figures 1 and 4) isdepressed. This key, by means of the pin 41 which is aixed to its keystem 45, Will act upon the cam 49 which is fixedly arranged on the shaft48,` rocking this cam as Well as the shaft 48 and all the other cams 50against the pressure of the springs 24 in the anti-clockwise direction(Figure 2). During this operation, the cams 58 will act upon the flanges5| of-the key lock bars 23. The latter will-now be displaced to theright (Figure 2) against the pressure of their springs 24, so

.that the pins 2| of the depressed keys K will disengage from thenotches 24a of the bars 23 and the keys K will be ableto return in anupward direction to their rest position under the action of theirsprings |9. After the cancelling key 1 has been released, the lock bars23, under the influence' of their springs 24, will return into theirrest position shown in Figure 2, and in addition the cams 50 and 48 arerocked back together with their .shaft 48 under-the influence oftheir lsprings 24 4intotI'iei'r rest. positionv shown -in Figure .2, whichisdeterminedfyby the pin 41 of the eliminating key stem `45 coming intocontact from below against thecover plate I2. f

Before discussing the oper the present invention works only'inv onedirection of rotation, i. e., in the case' of negative calculations thesubtrahend is not subtracted by a corvresponding inverse rotation butthe complement .I

of the subtrahend is added.

Let the value v87000 be subtracted from ther value 225000 which has beenregistered in the result register R, as in the above example. As

on account of the previous example, the machine is still adjusted foraddition, the registeringV of the ,value 87000 in the set of keys would,in

. the first place, cause a- Apreparatory closing of In consequence ofthe depression of 'thekeys l'KTh1- and.v- KTThin the,l lthousands .andten thousands places, the vi ndi :atorbars- 25 hayealso beendisplacedbymeans of the pins 2I,`, so that the figures corresponding ton g theIdepressed, keys become-visible throughtheinspection apertures 3Ifof-theindicator device .A

Besides this, 'the depression, of l the .keys KTM onto thekeystems I9f(Figure 2) to act. "upon the inclined surfaces 44 of the correspondingbars 3'1 so that the latter-are-.displaced inthe. direction of the arrowa. (Figure f8) and against the action of their springs 4I; Duringthisfope'ration,

vthe Contact springs 4 0, with their insulator members 39, spring intothe notches 38 of the bars 31, so-that thel contactsprings 40 with theircontact pins StTho and StTTho (Figure 1,2.) are other Vcircuits whichwould be rectified when the subtraction key 3 is depressed, as will bede-` scribed later on. As in .the addition example, it has been alreadydescribed how the circuits run when a ligure is registered on the set ofkeys K in the following circuits such as are preliminarily" closed whenthe value 87000 is registered in the t set of keys K, will not bedescribed, but only after the subtraction key has been depressed.

After the value 87000 hasV been registered in the set of'keys K,'thesubtraction keyl 3 isdepressed against theaction Aof its spring 11. In

. this operation,`the pin 18 which is'riveted on to the Vkey stem 16,acts upon the pin 86 of the shift cross 80, causing the latterto rotatein the anticlockwise direction round thepinl 82. Duringthis rotatingmovement, the notch 80a of plate I1, so that the contact plate` I1 isdisplaced in the direction of the arrow a. (Figure 2).

. During thedisplacement of the contact platef I1 (Figure 9), the nose|13:v of the locking pawl I1a disengages from the stop I1J of thecontact plate I1 and engages with 'the stop I1g of the contact plate I1,so that the latter is held in they displaced position indicated by thearrow.

When the subtraction key 3 (Figure 2) is depressed, the arm 80h .of theshift cross 80, which protrudes from the upper plate I2. of the keyboard K, is rocked from the position marked +f o the insulation disc S2,corresponding to the com`' l plementaryvalue to seven, the circuitZ, Z2,L2,

F, StSTh1, CTh'l, ATh, B4, W4, C'd is closed; The contact spring C'IThof the ten thousands place of the corresponding -key KTTh8 after thedisplacement of the contact plate I1, is put out of contact with thecontact pin StTThB and into contact with the contact pin StSTIh8 and, by

way of the insulator discs SI, corresponding to the complementary numberto eight the circuit z, z l Ll, G, sts'r'rha, CT'rh, ATTh, B5, W5, Cd isclosed. The keys KTh1 and KTThB are held in the depressed position bythe lock bars 23 (Figure 2) in the already described way.

lthe shift cross 80 actuates the pin 84 which is l arranged on ananglepiece 85 fixed to the contact theY separate, conductors.StS'Io--'AT-BL- mon conductor Z, Z9, S9, L9, I-II,y I-I and over 'ltorsion spring 6I inthe clockwise l.direction (Fig- Y'28, 66, 68, 1I, ashas been already described. At

put out of contact.

to'remainclosed by wayof the commonconductor Z, Z9,l L9, HI, H and theseparate conductors StSHTho, 40, AH'Ih, B6,v W6, Cd; StSMo 40AM B1W1-Cd; StSTMo-'40 ATM--BIl--Wtl Cd; StSHMo-Ml--AHM-BS- W9 and Cd.A A IThe remainingl four left totalizer places RIU- Rl3 of the resultregisterlR, which are'not connectedwith the nine vertical lkey rows,receive their current'by way of the contact" spring CLo, and thecontrolling .operationof the insulator disc .S9, i correspondingv tothecomplementary number to zero (Figure 12). vThe[circuit in this instanceruns from Z, Z9,. L9, HI, I-I, CLo, LLo by way of rSCI throughtheseparate conductors BIO-BI3, W,.I0-WI3. and Cd...

`In the tens and hundreds'places-where no values are registered, thedisplacement of the contact plate I1 causes. the contact springs 40 tobe put out of contact with the Contact pins StTo, StHoand into contactvwith the4 'contact pins StSTo, StSHo, thus closing the circuits by wayof the insulator discSS corresponding to thecomplementary numberto zero"over the com- W2-Cd and. StSI-Io'--4Il---AQ B3.'W3Cd.

- In the Yunits place, on the contact plate I1 being displaced inthedirectionof the arrow a, the contact spring 40 is disengagedjfrom thecontact pin StUo and is notput; into contact withy any contact pin. `Theeffect of this arrangement will be described in detail later on.

When the subtraction key3 (Figure 2) is depressed against the action ofits lspring' 11, it acts by means of its key stem 16 on to the lever 19awhich is arrangedon the rotatable shaft'51 and swings the shaft 51against the action of its ure 3) andthis vwill close the motor contact15a (Figs. 2 and,7) 'by way of the members 62, 64,

the Sametime, the nose 12 of the lever 68 releases the vnose 14a. of thelock diskl 14, so that the shaft 1 3 can rotate freely under. the actionof the motor M byfvway of the members |94, |93.

Immediately after the beginning of the rotation of the shaft 13, thetotalizer frame II1, II8 is rotated in the already described mannerround the shaft II5 in the anti-clockwise direction by way of themembers |29, I29a, |28, I28d,.I21, I21a, and in this operation, thegears |25 which are firmly connected with the numeral wheels I2I of theresult register R engage with the toothed segments I6I. During therotation of the frame wheels |25 in order to avoid any unnecessarynoise. The numeral wheels |2| of the result register R which areconnected with the toothed wheels |25, can in no instance execute anundesired rotation when released by the detents |35, whereby wrongvalues would be registered `in the result register, because the toothedwheels |25 are, at the same time, in mesh with the toothed segments 6|.

After further rotation, of the shaft 13, the insulator disc SI, whichcorresponds to the value 8, releases the contact springs |84, |85(Figure 3), so that now the above mentioned circuit is completelyclosed. The magnet |63 of theten thousands place thereupon attracts thearm |64, the toothed segment |6| being stoppedgby the fact that thetooth-shaped member |66 engages with the second tooth of the rack |68.-The rotation of the toothed segment |6| has causedthe numeral wheel 2|of the ten thousands place to rotate by one unit, so that in theinspection aperture of the result register R a 3 is showing.

After further rotation of the shaft 13, the insulator disc S2, which-corresponds to the value '1 in the ten thousands place, releases thecontact springs |84, |85 (Figure 3), so that they come into contact andthus completely close the above mentioned circuit. The magnet |63(Figure 5) of the thousands place of the result totalizer R, nowattracts the arm |64 and this causes the tooth-shaped member |66 toengagewith the third tooth of the rack |63, so that the toothed segment|6| is prevented from rotating any further. In this operation, thenumeral Wheel |2| ofthe thousands place has been rotated from to '1. Inthe inspection aperture of the result register R, therefore, a "7 willappear.

Just before the shaft 13 has completed half a revolution, the insulatordisc S9,` which corresponds to the values 0 releases the contact springs|84, |85 and this closes the circuits which have been described abovecompletely, this being the circuits for the second, third and sixth tothirteenth position of the result register R. At

the same time as the circuit is closed by the springs |84, |85, themagnets |63 become energised and cause the arms |64 with theirtoothshaped members |66 to engage with lthe tenth toothof the rack |68.The rotating of these toothed segments |6| causes the numeral wheels |2|to move from "0 to 9, so that in the inspection apertures of the resultregister R nines will appear.

nfthe result register R, therefore, #the fol-- lowing figure has beenadded:

which is the complement of the subtrahend As in the units place nocontact was preliminarily closed when the contact plate was displaced,the contact springs |84, |85 also did not close -any contact, so thatthe toothed segment |6| of the units position can, under the influenceof the spring |13, participate in the further swinging movement of theframe |15, |14, |16, remaining constantly in touch with the rod |14 ofthe frame |15, |14, |16. As the segment |6| of the units place couldswing still further and the toothed wheel I25-is in mesh withthe-toothed segment |6|, the numeral wheel |2| of the units place, whichis rigidly connected with'the toothed wheel |25, has been rotated by afurther unit, therefore from 9" to 0." During the rotation numeral wheeltherefore, not described again.

||1, ||8, the detents |35 also release the toothed of the numeral wheel|2| of the units place from 9 to 0, the pin |39 which is arranged on the|2| has rotated the sixteentoothed gear |4| which is loosely rotatablyarranged on the shaft |40 which is rigidly arranged on the two sideparts ||1, ||8 of the register frame, by one tooth round the shaft |40in the anti-clockwise direction (Figure 5). vIn this rotation haveY alsoparticipated the wheel |42 which II1, ||8 is swung into the restposition shown in Figures 2 and 5 by means of the cams |29, |2911 and byway of the rollers |28, |28a. In this operation, the toothed wheels |2|of the result register R are disengaged from the toothed segments 6|.

The toothed segments |6| are then rotated back into their normalposition shown in Figure 2, by the frame.|15, |14, |16 in the alreadydescribed manner. AJust before the shaft has completed one fullrevolution, the insulator disc So which corresponds to the figure 0 hasseparated the last contact springs |84, |85'so that all the circuits areinterrupted.

During the nrs: half of 'the revolution of the.

shaft 13, the disc |9| (Fig. `6) which is rmly arranged on the pin wheel|81, glides with its face rlilla past the face .|92 of the Maltese cross|88,

so that the latter is prevented from rotating. After half a revolution,the pins |88 of the pin Wheel |81 act upon the Maltese cross |89, inthat the teeth |89a of the latter mesh and rotate it in the direction ofthe arrow b shown in Figure 6. As the shaft ||5 is firmly connected withthis wheel, the shaft ||5 will also participate in this revolution.During this operation, the cam |43 of the unitsA position, which isfirmly arranged' on the shaft H5, acts upon the tooth |42a of thefour-toothed wheel |42 and rotates itround the shaft |40 in theyanti-clockwise direction (Figures 2, 5), by three tooth sections. Thefourtoothed wheel |44 which is firmly connected with the wheel |42 is,therefore, also rotated in |44 which acts together with the toothedwheel |25 which is arranged on'the numeral .wheel |2| of the secondcalculating position of the result register R rotates, by way of thetoothed wheel |25, the numeral wheel |2| of the second denominationalorder by one unit from 9 to 0 and this concludes the tens transfer inthis position.. The tens transfer to the next higher denominational'order takes place in the sameway and is. In the inspection apertures ofthe result register R can now be seen the result of the subtraction Nowthe value 87000 which is registered on the set 0f keys is eliminatedby'means of the cancelling key 1 in the already described manner,whereupon al1 the mechanism have ,returned to their rest position andthe next value 723 can be registered on the set of keys K.

According to the example ol calculation which has been set above thevalue 723 is now to be de- I which points to In the units place the KU3(Figure 1)j which 3, against the pressure 2), the contact spring`contact with the contact pin StSU3 (Figure 12).

" whereby, by way of the i is ,closed.` In

,AI-I, B3, W3, Cd are g In the six left hand rows of keys, in which nol,the same Way), Z, Z9, L9,

direction and during this ducted from the result the result register R.To this end the value '123 as indicated by the indicator lever 80h, thefollowing circuits are preliminarily closed.

corresponds to the value CU3 has been put into insulator disc, thecircuit Z, Z1, S1, L1, Q, QI, Q2, Q3, StSU3, CU3, AU, BI, WI Cd ispreliminarily closed. In the tens place the depression of the key KT2corresponds to the v alue 2, has put into the'contact the' contactspring CT2 with the contact pin StSTZ (Figure 12),\whereby, by way ofthe insulator disc S1,

mentary number to two QI, Q2, stsTz,

responds to the value '1, has put into contact the contact spring KH1138000 which appears in the same way inthe hundreds vplace thedepression of the key TH1 Which cor- The further rotation of the shaft13 will clause the insulator disc S1 which corresponds to'lgure f mustbe registered inthe set of' keys K. In' this operation,vthefmachineibeing adjusted to sub- 1- traction onaccountof the-previouscalculating operation,

A.2 Ain thel tensepositiommto release. yt

f circuit is ,denniteiyoios'efti whereiip' the result egister Rk helcontact alie '."wiulettreetthe erm itt, ignoring' th'isjoperetiondepressiomof the key l() of ,the spring 20 (Figure (Figurel) which i Iwould naturallyg'ive a wrong resul corresponding to the complethecircuit Z, Z1, L1, Q, CT2AT, B2, W2, Cd (Figure 12) with the contact pinStSI-I1,

whereby the circuit Z, Z2, L2, F, StSH1, CI-I1, v

preliminarily closed.

value is set, the contact springs 40 remain in contact with the contactpins STSToto StSHMo, the

.eighth tooth of the rack circuits (in the following only.` one circuitwill,

be described because all the others are closed in HI, ATh,-B4, W4, Cd(Figure 12) are preliminarily closed.

H, stsrho," CTno,

In the case of. the remaining four,leftcalculating positions R| -R|3 ofthe result register Rf which are not connected with the nine verticalvykey rows, the circuits, by way of the insulator disc S9 correspondingto theA complementary by Way of the contact spring number to zero andCLo, are preliminarily closed by way of the common conductor Z, Z9, L9,HI, H', CLO, LLo, by

wayof SC'| as well -as the separate conductors When the subtract-on key3 pressed, the contact al isclosed by way of the members 16, 19, 51, 62,64,28, 65, 68, and 1|. At

l the same time the nose v12 of the locking lever' .6B-releases the nose14a of the locking disc 14 so that now the. shaft 13v can ,be rotated inthe direction ofthe arrow.

' Shortly after thebeginning of the rotation of Vthe shaft 13 theregister frame ||1, ||8 (Figures .2 end 5) .is rotated by way ofthemembers |29,

|21, |21a in the already describedv |2911, |28, |28a, manner round theshaft I5 in the anti-clockwise wheels mesh with the During the rotationof the frame ||1, ||8 the detents also release the toothed wheels |25.

During the further rotation of the shaft 13,

the insulator disc S2,

tact springs' |84, |85 (Figure 3) so that the cir'- cuit is nowentirelyclosed. Now the magnet |63 (Figures 2 and 5) of the hundredsposition of the result register R, attracts the arm |64, so that thetooth-shaped member of the armv |66 engages with the third tooth of therack |68 and thus holds the toothed segment |6| in position. The numeralwheel therefore, shows a 2.

operation the toothedV toothed segments |6|.

which, corresponds to the value .1 in the hundreds place, releases thecon-A |2| ofthe hundreds place,l

of Vkeys and the four `40 (Figure 2) is de# The l'register showedroe0000000138000 'The'complement ofthe subtrat.

hend 723 was added h A,{-,99999999992'1'1 Therefore, vwithoutconsidering1 'the tens transfer movement;

V `the register would show fs .99 99999027277v f As in theuhit's piacee' key Q22 Q7 S1 will close,

the toot 7shaped,[member uit wiiiehga theeigh'th ltoothiiof `the 'rack,segment 6| ofthe `tens place cam-thereforanot rotate any furtherand,this willialzso'preveit the 12|, from rotatig'gand ai .Tlwill' appearinthe inspection aperture ,of the tens'place. has been depressed ue3, "theresult 'which corresponds .to the V would be, as thecomplementaryfililiiinber of 3' is 6,`

only e er wouid he added'to' theiiihits and this Therefore in the caseof negative calculation always a 1 must be added in ,the .units place,andthisis obtained byfswitching over according tothe circuit diagramillustrated in Figure 12,. As vthe current,

as already stated, goes4 by Way of the contact spring CU3, the contact-pin( StSU3, the circuit L1, Z1, Z etc.,. the insulator disc 'at' thesame time 'as the circuit yclosed in the tens place, the circuit in theunits place, and therefore, the magnetl |63 of the units place willattract the arm l|64 and will cause its tooth-shaped member |66to'engage 'with the y |68, whereby the rotation of the segment l6| ofthe units'place and the rotation. of the corresponding numeral wheel |2|are completed. The'numeralwheel |2|, there- Before the completion'of`halfra revolution of thejshertis, the ihsu'lator disc yse) 'whichcorref0 of the remaining six rows left positi'ons of the resultregisterI R|0- R|3, releasesfthe Contact springs |84, .|85,'wh erebythe' 'abovedescribed circuits are completely closed. Theclosing of thecirspondsto .the Value cuits 'by the springs' |84, |85 causes themagnets|63 to attract the arms |64 so that thel latter will rengage withtheir'.toothshaped members |66 .with the tenth toothrof thev rack, Theswinging of these toothed segments |6| caused'there'spective numeralWheels to rotate thrcriugh` nine units.

, AshoweverQduri gthisaddingmovernent, the

. Iwise direction (Figures cams |29,r |29a,.the

in the first place rotated into its normal position numeral wheel |`2|.in the thousands'place moved |39'of the numeral wheel sixteen-toothwheel:v |4| and sector in an'antifclock- 2 andf5), thus preparing 2acted-'uponhthe y rotated it, by one, tooth a tens transfer. l

-When the frame .|15, |14, |716 has reached its extreme outswungposition determined by the register frame ||1, ||8 is shown in Figure 2by means of the camsA |29, |29a by way of the rollers |28, |28a in thisposition. the toothed wheels |25 are disengaged from the toothedsegments |6|. Further rotation. of the cams |29, |29a will 'cause theframe |15,` |14, |16 to rotate into its rest position shown in Figure 2,the rod |14 of the frame |15, |14, |16 taking along the toothed segments|6| successively and

